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In the previous chapters, we focused on sound propagation in horizontally stratified media, for which the acoustic properties are a function of only one dimension. In general, however, the acoustic characteristics of the ocean and seabed vary in three dimensions. As a step toward accommodating this full multidimensional variability, we consider an intermediate, two dimensional case in which the acoustic properties vary in both range and depth. For simplicity, we assume that the variation in range is much slower than the variation in depth, which is a good approximation to the real ocean environment. This assumption enables us to synthesize the sound field from ...

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